US8318736B2 - HIV inhibiting 5,6-substituted pyrimidines - Google Patents

HIV inhibiting 5,6-substituted pyrimidines Download PDF

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US8318736B2
US8318736B2 US12/521,379 US52137907A US8318736B2 US 8318736 B2 US8318736 B2 US 8318736B2 US 52137907 A US52137907 A US 52137907A US 8318736 B2 US8318736 B2 US 8318736B2
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cyano
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US20100261722A1 (en
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Jerôme Emile Georges Guillemont
Céline Isabelle Mordant
Benoit Antoine Schmitt
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    • A—HUMAN NECESSITIES
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    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
    • A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
    • A61K31/506—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim not condensed and containing further heterocyclic rings
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P25/00—Drugs for disorders of the nervous system
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/12—Antivirals
    • A61P31/14—Antivirals for RNA viruses
    • A61P31/18—Antivirals for RNA viruses for HIV
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
    • C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
    • C07D239/46—Two or more oxygen, sulphur or nitrogen atoms
    • C07D239/48—Two nitrogen atoms
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/06—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
    • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
    • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/04—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D405/00—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom
    • C07D405/02—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings
    • C07D405/12—Heterocyclic compounds containing both one or more hetero rings having oxygen atoms as the only ring hetero atoms, and one or more rings having nitrogen as the only ring hetero atom containing two hetero rings linked by a chain containing hetero atoms as chain links
    • C—CHEMISTRY; METALLURGY
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    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D409/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms
    • C07D409/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings
    • C07D409/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/04—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings directly linked by a ring-member-to-ring-member bond
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/06—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a carbon chain containing only aliphatic carbon atoms

Definitions

  • This invention concerns 5,6-substituted pyrimidine derivatives having HIV (Human Immunodeficiency Virus) replication inhibiting properties, the preparation thereof and pharmaceutical compositions comprising these compounds.
  • HIV Human Immunodeficiency Virus
  • HAART typically involves combinations of nucleoside or nucleotide reverse transcriptase inhibitors (NRTIs or NtRTIs respectively) with a non-nucleoside reverse transcriptase inhibitor (NNRTI) or a protease inhibitor (PI).
  • NRTIs or NtRTIs nucleoside or nucleotide reverse transcriptase inhibitors
  • NRTI non-nucleoside reverse transcriptase inhibitor
  • PI protease inhibitor
  • the present invention is aimed at providing particular novel series of pyrimidine derivatives having HIV replication inhibiting properties.
  • WO 99/50250, WO 00/27825, WO 01/85700, and WO 06/035067 disclose certain classes of substituted aminopyrimidines having HIV replication inhibiting properties.
  • the compounds of the invention differ from prior art compounds in structure, pharmacological activity and/or pharmacological potency. It has been found that the introduction of certain substituents in the 5-position and 6-position of specifically substituted pyrimidines results in compounds not only acting favorably by their capability to inhibit the replication of Human Immunodeficiency Virus (HIV), but also by their improved ability to inhibit the replication of mutant strains, in particular of strains that have become resistant to one or more known NNRTI drugs, which strains are referred to as drug- or multidrug-resistant HIV strains.
  • HIV Human Immunodeficiency Virus
  • the present invention concerns compounds of formula
  • C 1-4 alkyl as a group or part of a group defines straight or branched chain saturated hydrocarbon radicals having from 1 to 4 carbon atoms such as methyl, ethyl, 1-propyl, 2-propyl, 1-butyl, 2-butyl, 2-methyl-propyl, t.butyl;
  • C 1-6 alkyl as a group or part of a group defines straight or branched chain saturated hydrocarbon radicals having from 1 to 6 carbon atoms such as the group defined for C 1-4 alkyl and 1-pentyl, 2-pentyl, 1-hexyl, 2-hexyl, 3-hexyl, 2-methylbutyl, 3-methylpentyl, and the like;
  • C 1-2 alkyl defines methyl or ethyl;
  • C 3-7 cycloalkyl is generic to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl and cycloheptyl.
  • C 2-6 alkenyl as a group or part of a group defines straight and branched chained hydrocarbon radicals having saturated carbon-carbon bonds and at least one double bond, and having from 2 to 6 carbon atoms, such as, for example, ethenyl (or vinyl), 1-propenyl, 2-propenyl (or allyl), 1-butenyl, 2-butenyl, 3-butenyl, 2-methyl-2-propenyl, 1-pentenyl, 2-pentenyl, 3-pentenyl, 2-methyl-1-butenyl, 1-hexenyl, 2-hexenyl, 3-hexenyl, 4-hexenyl, 2-methyl-2-pentenyl, 1,2-dimethyl-1-butenyl and the like.
  • C 2-6 alkenyls having one double bond are preferred. Of interest amongst C 2-6 alkenyl radicals are the C 2-4 alkenyl radicals.
  • the term “C 3-6 alkenyl” is as C 2-6 alkenyl but is limited to unsaturated hydrocarbon radicals having from 3 to 6 carbon atoms. In the instances where a C 3-6 alkenyl is linked to a heteroatom, the carbon atom linked to the heteroatom by preference is saturated. This e.g. is the case for C 3-6 alkenyl substituted with hydroxy where the hydroxy preferably is not on a double bonded carbon atom.
  • C 2-6 alkynyl as a group or part of a group defines straight and branched chained hydrocarbon radicals having saturated carbon-carbon bonds and at least one triple bond, and having from 2 to 6 carbon atoms, such as, for example, ethynyl, 1-propynyl, 2-propynyl, 1-butynyl, 2-butynyl, 3-butynyl, 2-methyl-2-propynyl, 2-pentynyl, 3-pentynyl, 2-hexynyl, 3-hexynyl, 4-hexynyl, 2-methyl-2-butynyl, 2-methyl-2-pentynyl and the like.
  • C 2-6 alkynyls having one triple bond are preferred. Of interest amongst C 2-6 alkynyl radicals are the C 2-4 alkynyl radicals.
  • the term “C 3-6 alkynyl” is as C 2-6 alkynyl but is limited to unsaturated hydrocarbon radicals with at least one triple bond having from 3 to 6 carbon atoms. In the instances where a C 3-6 alkynyl is linked to a heteroatom, the carbon atom linked to the heteroatom by preference is saturated. This e.g. is the case for C 3-6 alkynyl substituted with hydroxy where the hydroxy preferably is not on a triple bonded carbon atom.
  • ( ⁇ O) refers to a carbonyl moiety when attached to a carbon atom, a sulfoxide moiety when attached to a sulfur atom and a sulfonyl moiety when two of said terms are attached to a sulfur atom.
  • carboxyl carboxy or hydroxycarbonyl refer to a group —COOH.
  • halo is generic to fluoro, chloro, bromo or iodo.
  • polyhaloC 1-6 alkyl as a group or part of a group, e.g. in polyhaloC 1-6 alkoxy, is defined as mono- or polyhalo substituted C 1-6 alkyl, in particular C 1-6 alkyl substituted with up to one, two, three, four, five, six, or more halo atoms, such as methyl or ethyl with one or more fluoro atoms, for example, difluoromethyl, trifluoromethyl, trifluoro-ethyl. Preferred is trifluoromethyl.
  • perfluoroC 1-6 alkyl groups which are C 1-6 alkyl groups wherein all hydrogen atoms are replaced by fluoro atoms, e.g. pentafluoroethyl.
  • fluoro atoms e.g. pentafluoroethyl.
  • the halogen atoms may be the same or different.
  • any of the heterocycles mentioned in the definitions of Het is meant to comprise any isomer such as for example oxadiazole may be 1,2,4-oxadiazole, 1,3,4-oxadiazole, or 1,2,3-oxadiazole; likewise for thiadiazole, which may be 1,2,4-thiadiazole, 1,3,4-thiadiazole, or 1,2,3-thiadiazole; similarly, pyrrole may be 1H-pyrrole, or 2H-pyrrole.
  • the group Het can be oxazolyl or thiazoyl, which preferably are 1,3-oxazolyl or 1,3-thiazolyl, respectively.
  • Any pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl, piperazinyl in particular is substituted to the remainder of the molecule via its nitrogen atom.
  • Any piperazinyl being substituted such as with C 1-6 alkyl, C 1-6 alkylcarbonyl, or with hydroxyC 1-6 alkyl, is preferably substituted at the nitrogen through which the piperazine is not connected to the remainder of the molecule (in many instances the 4-nitrogen).
  • each Het independently is pyridyl, thienyl, furanyl, oxazolyl, or thiazolyl.
  • radical Whenever a radical occurs in the definition of the compounds of formula (I) or in any of the subgroups specified herein, said radical independently is as specified above in the definition of the compounds of formulas (I) or in the more restricted definitions as specified hereinafter.
  • radical positions on any molecular moiety used in the definitions may be anywhere on such moiety as long as it is chemically stable.
  • pyridine includes 2-pyridine, 3-pyridine and 4-pyridine
  • pentyl includes 1-pentyl, 2-pentyl and 3-pentyl.
  • the pharmaceutically acceptable addition salt forms which the compounds of the present invention are able to form, can conveniently be prepared using the appropriate acids, such as, for example, inorganic acids such as hydrohalic acids, e.g. hydrochloric or hydrobromic acid, sulfuric, hemisulphuric, nitric, phosphoric, and the like acids; or organic acids such as, for example, acetic, aspartic, dodecyl-sulphuric, heptanoic, hexanoic, nicotinic, propanoic, hydroxyacetic, lactic, pyruvic, oxalic, malonic, succinic, maleic, fumaric, malic, tartaric, citric, methanesulfonic, ethanesulfonic, benzene-sulfonic, p-toluenesulfonic, cyclamic, salicylic, p-amino-salicylic, pamoic, and the like acids.
  • the compounds of formula (I) containing acidic protons may be converted into their pharmaceutically acceptable metal or amine addition salt forms by treatment with appropriate organic and inorganic bases.
  • Appropriate base salt forms comprise, for example, the ammonium salts, the alkali and earth alkaline metal salts, e.g. the lithium, sodium, potassium, magnesium, calcium salts and the like, salts with organic bases, e.g.
  • primary, secondary, and tertiary aliphatic and aromatic amines such as methylamine, ethylamine, propylamine, isopropylamine, the four butylamine isomers, dimethyl-amine, diethylamine, diethanolamine, dipropylamine, diisopropylamine, di-n-butylamine, pyrrolidine, piperidine, morpholine, trimethylamine, triethylamine, tripropylamine, quinuclidine, pyridine, quinoline and isoquinoline, the benzathine, N-methyl-D-glucamine, 2-amino-2-(hydroxymethyl)-1,3-propanediol, hydrabamine salts, and salts with amino acids such as, for example, arginine, lysine and the like.
  • the salt form can be converted by treatment with acid into the free acid form.
  • solvate is meant to comprise hydrates and solvent addition forms that the compounds of formula (I), including stereoisomeric forms thereof, can form.
  • solvates are e.g. hydrates, alcoholates, such as methanolates, ethanolates, i.propanolates, n.propanolates, and the like.
  • the compounds of formula (I) thereof may contain one or more centers of chirality and may exist as stereochemically isomeric forms. Of special interest are those compounds of formula (I) that are stereochemically pure.
  • stereochemically isomeric forms as used herein defines all the possible stereoisomeric forms of the compounds of formula (I), the pharmaceutically acceptable addition salts thereof, and the pharmaceutically acceptable solvates thereof.
  • the chemical designation of compounds denotes the mixture of all possible stereochemically isomeric forms, said mixtures containing all diastereomers and enantiomers of the basic molecular structure as well as each of the individual isomeric forms of formula (I), the pharmaceutically acceptable addition salts thereof, and the pharmaceutically acceptable solvates thereof substantially free, i.e. associated with less than 10%, preferably less than 5%, in particular less than 2% and most preferably less than 1% of the other isomers.
  • a compound of formula (I) is for instance specified as (E)
  • stereogenic centers may have the R- or S-configuration; substituents on bivalent cyclic (partially) saturated radicals may have either the cis- or trans-configuration.
  • the present invention is also intended to include any isotopes of atoms present in the compounds of the invention.
  • isotopes of hydrogen include tritium and deuterium and isotopes of carbon include C-13 and C-14.
  • substituents can be selected each independently out of a list of definitions, such as for example for R 1 and R 5d , any possible combinations are intended to be included that are chemically possible or that lead to molecules of such chemical stability that they can be processed in standard pharmaceutical procedures.
  • R 9 in the compounds of formula (I) or (I-a) is C 1-6 alkyl, C 2-6 alkenyl, or C 1-6 alkynyl, each substituted with cyano.
  • R 8 in the compounds of formula (I) or (I-a) is C 2 alkyl, C 2 alkenyl, or C 2 alkynyl, each substituted with cyano; wherein the cyano in particular is substituted at a carbon atom that is not linked to the phenyl group.
  • R 8 can be represented by a radical -A-CN, wherein A is —CH 2 —CH 2 —, —CH ⁇ CH—, or —C ⁇ C—.
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein R 1 is hydrogen.
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein R 6 is methoxymethyl.
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein each R 10 independently is C 1-6 alkyl, amino, mono- or di(C 1-6 alkyl)amino.
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein each r is 2.
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein
  • Embodiments of the present invention are those compounds of formula (I) or any of the subgroups of compounds of formula (I) wherein each aryl independently is phenyl or phenyl substituted with one, two or three substituents each independently selected from those mentioned above or in particular from:
  • the compounds of formula (I) can be prepared by reacting an intermediate of formula (II) wherein W represents a suitable leaving group, such as for example halogen, e.g. chloro, bromo or a tosyl, mesyl, and the like groups, with an intermediate of formula (III).
  • W represents a suitable leaving group, such as for example halogen, e.g. chloro, bromo or a tosyl, mesyl, and the like groups
  • the reaction of (II) with (III) is usually conducted in the presence of a suitable solvent.
  • suitable solvents are for example an alcohol, such as for example ethanol, 2-propanol; a dipolar aprotic solvent such as acetonitrile, N,N-dimethylformamide, N,N-dimethyl-acetamide, 1-methyl-2-pyrrolidinone; an ether such as tetrahydrofuran, 1,4-dioxane, propylene glycol monomethylether.
  • the reaction can be done under acid conditions obtained by adding amounts of a suitable acid such as for example camphor sulfonic acid, or by using acid solvents, e.g. hydrochloric acid dissolved in an alkanol such as 1- or 2-propanol.
  • the compounds of formula (I) can also be prepared by forming the X linkage by either reacting (IV-a) with (V-a) or (IV-b) with (V-b) as outlined in the following scheme.
  • W represents an appropriate leaving group, which in particular is as specified above.
  • the leaving group W in (V-a) may also be introduced in situ, e.g. by converting the corresponding hydroxy function into a leaving group for example by POCl 3 .
  • X 1 represents —NR 1 —, —O—, —S—.
  • X 1 is NR 1
  • the above reactions preferably are conducted in the presence of a tertiary amine base, e.g. triethylamine.
  • X 1 represents O or S
  • the above reactions are conducted in the presence of a base such as for example K 2 CO 3 or potassium t-butoxide (KOt-Bu).
  • the compounds of formula (I) wherein R 5 is a group Het can be prepared by a Suzuki reaction, i.e. by reacting a 6-halopyrimidine derivative (VI) with a heterocyclyl boric acid Het-B(OH) 2 or heterocyclyl boric acid ester (in particular an alkyl ester such as methyl or ethyl ester) in the presence of a palladium catalyst, in particular Pd(PPh 3 ) 4 .
  • W 1 is halo (such as I, Br or Cl) or a pseudohalo group (such as triflate).
  • the compounds of formula (I) wherein R 5 is a group —C( ⁇ O)NR 5a R 5b , said compounds being represented by formula (I-c), can be prepared by reacting a carboxylic acid or an active form thereof (VII) with an amine (VIII), in an amide bond forming reaction.
  • the amide bond forming reaction may be performed by reacting the starting materials in the presence of a coupling agent or by converting the carboxyl group in (VII) into an activated form such as a carboxylic acid halide such as an acid chloride or bromide, a carboxylic acid azide, a mixed carbonic-carboxylic acid anhydride (e.g. by reaction with isobutyl chloroformate), an active ester (p-nitrophenyl ester, pentachloro-phenylester, N-hydroxysuccinic imido ester).
  • the amines (VIII) may also be reacted with carboxylic acid lower alkyl esters, in particular the methyl or ethyl esters.
  • Examples of coupling agents include the carbodiimides (dicyclohexylcarbodiimide, diisopropylcarbodiimide, or water-soluble carbodiimide such as N-ethyl-N′-[(3-dimethylamino)propyl]carbodiimide) or carbonyldiimidazoles.
  • Some of these methods can be enhanced by adding suitable catalysts, e.g. in the carbodiimide method by adding 1-hydroxybenzotriazole or 4-dimethylaminopyridine (4-DMAP).
  • the amide bond forming reactions preferably are conducted in an inert solvent, such as halogenated hydrocarbons, e.g. dichloromethane, chloroform, dipolar aprotic solvents such as acetonitrile, dimethylformamide, dimethylacetamide, ethers such as tetrahydrofuran.
  • an inert solvent such as halogenated hydrocarbons, e.g. dichloromethane, chloroform, dipolar aprotic solvents such as acetonitrile, dimethylformamide, dimethylacetamide, ethers such as tetrahydrofuran.
  • a suitable base such as a tertiary amine, e.g. triethylamine, diisopropylethylamine (DIPEA), N-methylmorpholine, N-methylpyrrolidine, or 4-DMAP.
  • the compounds of formula (I) wherein R 5 is —CH 2 —NR 5e R 5f , said compounds being represented by formula (I-d), can be prepared by a reductive amination reaction starting from the aldehydes (IX) with an amine (XI).
  • the reductive amination may be conducted with hydrogen in the presence of a noble metal catalyst such as Pt or Pd, or with a cyanoborohydride.
  • These compounds can also be prepared by an N-alkylation reaction starting from intermediates (X), wherein W is as specified above and in particular is chloro or bromo, with an amine (XI).
  • the compounds of formula (I-f), which are compounds of formula (I) wherein R 5 is —CH(OR 5c )R 5d , can be prepared by reacting a pyrimidine aldehyde of formula (XII) with an organo-metal compound (M-R 5d ).
  • the thus obtained compounds of formula (I-e) can be converted to the corresponding compounds of formula (I-f), which are corresponding compounds wherein R 5c is other than hydrogen.
  • the group R 5c can be introduced by an ether forming reaction such as an O-alkylation reaction with a reagent W 1 —R 5c , wherein W 1 is a leaving group such as halo, in particular chloro, bromo or iodo, or a sulfate or azide group.
  • W 1 is a leaving group such as halo, in particular chloro, bromo or iodo, or a sulfate or azide group.
  • M in M-R 5d is a metal such as an alkali metal, in particular Li, Na or K, or a magnesium derivative such as a Grignard type of reagent (M-R 5 is halo-Mg—R 5 ).
  • M-R 5 is halo-Mg—R 5
  • These reactions typically are conducted in a reaction-inert solvent such as an ether (tetrahydrofuran, diethylether, dioxane) or a halogenated hydrocarbon
  • the compounds of formula (I-g), which are compounds of formula (I) wherein R 5 is R 5e , the latter being substituted C 2-6 alkenyl or C 2-6 alkynyl, can be prepared by reacting an intermediate (VI), which is as specified above, with an organometallic or organoboric alkene or alkyne derivative R 5e -M 1 .
  • M 1 represents boronic acid or a boronic acid ester
  • this reaction is a Suzuki type of reaction.
  • M 1 is a trialkylstannane, in particular a tributyl stannane, this reaction is a Stille reaction.
  • reaction Another type of reaction that can be used is the Heck reaction where the alkene is reacted with (VI) in the presence of a palladium catalyst.
  • Pd-catalysed cross couplings of heteroaryl halides that can be used are the Kumada coupling, Hiyama coupling, and the Sonogashira coupling.
  • Intermediates of formula (II) can be prepared by reacting an intermediate of formula (XIII) wherein each W is as defined hereinabove, with an intermediate of formula (XIV) in a suitable solvent, such as for example tetrahydrofuran, usually in the presence of a suitable base, such as for example Na 2 CO 3 .
  • a suitable solvent such as for example tetrahydrofuran
  • a suitable base such as for example Na 2 CO 3
  • the intermediates (V-a) and (V-b) can be prepared as follows:
  • Pyrimidine derivative (XV) for example 2,4-dichloropyrimidine is reacted with aniline derivative (XVI) yielding (V-a), or similarly, pyrimidine derivative (XVII) is reacted with (XVI) yielding (V-b).
  • the X 1 group in (XVI) is protected, e.g. in case of X 1 being an amine by an acetyl, butyloxycarbonyl, or benzyl group, or in case of X 1 being O by a methyl, benzyl or t.Bu group.
  • the protecting group is removed and (V-b) is obtained.
  • the reactions of (XV) or (XVII) with (XVI) are conducted in a reaction inert solvent, usually in the presence of a base.
  • an arylguanidine (XVIII) is condensed with an acetoacetic acid (XIX), e.g. with 4-methoxyacetoacetic acid.
  • XIX acetoacetic acid
  • XXI halopyrimidine
  • a halogenating agent such as POCl 3 .
  • the halo group is substituted by an aniline derivative (XXII) to pyrimidine derivative (XXIII).
  • the latter is halogenated, yielding an intermediate (VI).
  • the halogenation of (XXIII) can be done with iodine chloride (ICl), in which case W 1 in (VI-a) is iodo.
  • Intermediates (VI-a) can be converted to the corresponding carboxylic acid esters (XXIV) using carbon monoxide in the presence of a catalyst such as a Pd catalyst, e.g. PdCl 2 (PPh 3 ) 2 (i.e. bis(triphenylphosphine)palladium(II) chloride) in an alcohol in the presence of a base.
  • a catalyst such as a Pd catalyst, e.g. PdCl 2 (PPh 3 ) 2 (i.e. bis(triphenylphosphine)palladium(II) chloride) in an alcohol in the presence of a base.
  • Pd catalyst e.g. PdCl 2 (PPh 3 ) 2 (i.e. bis(triphenylphosphine)palladium(II) chloride)
  • Basic hydrolysis of (XXIV) yields acids (VII-a).
  • N-bromosuccinimide in the presence of a suitable solvent, such as for example acetic acid.
  • a suitable solvent such as for example acetic acid.
  • Compounds of formula (I) wherein R 1 represents C 1-6 alkyloxycarbonyl can be converted into a compound of formula (I) wherein R 1 represents hydrogen, by reaction with a suitable base, such as for example sodium hydroxide or methoxide.
  • a suitable base such as for example sodium hydroxide or methoxide.
  • R 1 is t.butyloxycarbonyl
  • the corresponding compounds wherein R 1 is hydrogen can be made by treatment with trifluoroacetic acid.
  • Some of the compounds of formula (I) and some of the intermediates in the present invention may contain an asymmetric carbon atom.
  • Pure stereochemically isomeric forms of said compounds and said intermediates can be obtained by the application of art-known procedures.
  • diastereoisomers can be separated by physical methods such as selective crystallization or chromatographic techniques, e.g. counter current distribution, liquid chromatography and the like methods.
  • Enantiomers can be obtained from racemic mixtures by first converting said racemic mixtures with suitable resolving agents such as, for example, chiral acids, to mixtures of diastereomeric salts or compounds; then physically separating said mixtures of diastereomeric salts or compounds by, for example, selective crystallization or chromatographic techniques, e.g.
  • the compounds of formula (I) show antiretroviral properties (reverse transcriptase inhibiting properties), in particular against HIV, the aetiological agent of Acquired Immune Deficiency Syndrome (AIDS) in humans.
  • the HIV virus preferentially infects human T-4 cells and destroys them or changes their normal function, particularly the coordination of the immune system.
  • an infected patient has an ever-decreasing number of T-4 cells, which moreover behave abnormally.
  • the immunological defence system is unable to combat infections and neoplasms and the HIV infected subject usually dies by opportunistic infections such as pneumonia, or by cancers.
  • HIV infection Other conditions associated with HIV infection include thrombocytopaenia, Kaposi's sarcoma and infection of the central nervous system characterized by progressive demyelination, resulting in dementia and symptoms such as, progressive dysarthria, ataxia and disorientation. HIV infection further has also been associated with peripheral neuropathy, progressive generalized lymphadenopathy (PGL) and AIDS-related complex (ARC).
  • PDL progressive generalized lymphadenopathy
  • ARC AIDS-related complex
  • the present compounds also show activity against drug- and multidrug-resistant HIV strains, in particular multidrug resistant HIV strains, more in particular the present compounds show activity against HIV strains that have acquired resistance to one or more art-known non-nucleoside reverse transcriptase inhibitors, in particular those that have been approved for therapy such as efavirenz, delavirdine, and nevirapine.
  • the compounds of formula (I), the pharmaceutically acceptable addition salts thereof, and the stereoisomeric forms thereof are useful in the treatment of individuals infected by HIV and for the prophylaxis of these infections.
  • the compounds of the present invention may also find use in the treatment of warm-blooded animals infected with viruses whose existence is mediated by, or depends upon, the enzyme reverse transcriptase.
  • Conditions that may be prevented or treated with the compounds of the present invention include AIDS, AIDS-related complex (ARC), progressive generalized lymphadenopathy (PGL), as well as chronic Central Nervous System diseases caused by retroviruses, such as, for example HIV mediated dementia and multiple sclerosis.
  • AIDS AIDS-related complex
  • PDL progressive generalized lymphadenopathy
  • retroviruses such as, for example HIV mediated dementia and multiple sclerosis.
  • the compounds of the present invention or any subgroup thereof may therefore be used as medicines against above-mentioned conditions.
  • Said use as a medicine or method of treatment comprises the administration to HIV-infected subjects of an amount effective to combat the conditions associated with HIV and other pathogenic retroviruses, especially HIV-1.
  • the compounds of formula (I) may be used in the manufacture of a medicament for the treatment or the prevention of HIV infections.
  • this invention provides a method of treating warm-blooded animals, including humans, suffering from or a method of preventing warm-blooded animals, including humans, to suffer from viral infections, especially HIV infections.
  • Said method comprises the administration, preferably oral administration, of an effective amount of a compound of formula (I), a pharmaceutically acceptable addition salt, a pharmaceutically acceptable solvate thereof, or a possible stereoisomeric form thereof, to warm-blooded animals, including humans.
  • compositions for treating viral infections comprising a therapeutically effective amount of a compound of formula (I) and a pharmaceutically acceptable carrier or diluent.
  • compositions of the present invention may be formulated into various pharmaceutical forms for administration purposes.
  • compositions there may be cited all compositions usually employed for systemically administering drugs.
  • an effective amount of the particular compound, optionally in addition salt form, as the active ingredient is combined in intimate admixture with a pharmaceutically acceptable carrier, which carrier may take a wide variety of forms depending on the form of preparation desired for administration.
  • a pharmaceutically acceptable carrier which carrier may take a wide variety of forms depending on the form of preparation desired for administration.
  • These pharmaceutical compositions are desirable in unitary dosage form suitable, particularly, for administration orally, rectally, percutaneously, or by parenteral injection.
  • any of the usual pharmaceutical media may be employed such as, for example, water, glycols, oils, alcohols and the like in the case of oral liquid preparations such as suspensions, syrups, elixirs, emulsions, and solutions; or solid carriers such as starches, sugars, kaolin, diluents, lubricants, binders, disintegrating agents and the like in the case of powders, pills, capsules, and tablets. Because of their ease in administration, tablets and capsules represent the most advantageous oral dosage unit forms, in which case solid pharmaceutical carriers are obviously employed.
  • the carrier will usually comprise sterile water, at least in large part, though other ingredients, for example, to aid solubility, may be included.
  • injectable solutions for example, may be prepared wherein the carrier comprises a saline solution, a glucose solution, or a mixture of saline and glucose solution.
  • injectable suspensions may also be prepared in which case appropriate liquid carriers, suspending agents and the like may be employed.
  • solid form preparations that can be converted, shortly before use, to liquid form preparations.
  • the carrier optionally comprises a penetration enhancing agent and/or a suitable wetting agent, optionally combined with suitable additives of any nature in minor proportions, which additives do not introduce a significant deleterious effect on the skin. Said additives may facilitate the administration to the skin and/or may be helpful for preparing the desired compositions.
  • These compositions may be administered in various ways, e.g., as a transdermal patch, as a spot-on, as an ointment.
  • the compounds of the present invention may also be administered via inhalation or insufflation by means of methods and formulations employed in the art for administration via this way.
  • the compounds of the present invention may be administered to the lungs in the form of a solution, a suspension or a dry powder. Any system developed for the delivery of solutions, suspensions or dry powders via oral or nasal inhalation or insufflation are suitable for the administration of the present compounds.
  • Unit dosage form refers to physically discrete units suitable as unitary dosages, each unit containing a predetermined quantity of active ingredient calculated to produce the desired therapeutic effect in association with the required pharmaceutical carrier.
  • unit dosage forms are tablets (including scored or coated tablets), capsules, pills, powder packets, wafers, suppositories, injectable solutions or suspensions and the like, and segregated multiples thereof.
  • an effective daily amount would be from 0.01 mg/kg to 50 mg/kg body weight, more preferably from 0.1 mg/kg to 10 mg/kg body weight. It may be appropriate to administer the required dose as two, three, four or more sub-doses at appropriate intervals throughout the day. Said sub-doses may be formulated as unit dosage forms, for example, containing 1 to 1000 mg, and in particular 5 to 200 mg of active ingredient per unit dosage form.
  • the exact dosage and frequency of administration depends on the particular compound of formula (I) used, the particular condition being treated, the severity of the condition being treated, the age, weight and general physical condition of the particular patient as well as other medication the individual may be taking, as is well known to those skilled in the art. Furthermore, it is evident that said effective daily amount may be lowered or increased depending on the response of the treated subject and/or depending on the evaluation of the physician prescribing the compounds of the instant invention.
  • the effective daily amount ranges mentioned hereinabove are therefore only guidelines and are not intended to limit the scope or use of the invention to any extent.
  • the present compounds of formula (I) can be used alone or in combination with other therapeutic agents, such as anti-virals, antibiotics, immunomodulators or vaccines for the treatment of viral infections. They may also be used alone or in combination with other prophylactic agents for the prevention of viral infections.
  • the present compounds may be used in vaccines and methods for protecting individuals against viral infections over an extended period of time.
  • the compounds may be employed in such vaccines either alone or together with other compounds of this invention or together with other anti-viral agents in a manner consistent with the conventional utilization of reverse transcriptase inhibitors in vaccines.
  • the present compounds may be combined with pharmaceutically acceptable adjuvants conventionally employed in vaccines and administered in prophylactically effective amounts to protect individuals over an extended period of time against HIV infection.
  • the combination of one or more additional antiretroviral compounds and a compound of formula (I) can be used as a medicine.
  • the present invention also relates to a product containing (a) a compound of formula (I), and (b) one or more additional antiretroviral compounds, as a combined preparation for simultaneous, separate or sequential use in anti-HIV treatment.
  • the different drugs may be combined in a single preparation together with pharmaceutically acceptable carriers.
  • Said other antiretroviral compounds may be any known antiretroviral compounds such as suramine, pentamidine, thymopentin, castanospermine, dextran (dextran sulfate), foscarnet-sodium (trisodium phosphono formate); nucleoside reverse transcriptase inhibitors (NRTIs), e.g.
  • NRTIs non-nucleoside reverse transcriptase inhibitors
  • NcRTIs nucleotide-competing reverse transcriptase inhibitors
  • TAT-inhibitors e.g. RO-5-3335, BI-201, and the like
  • REV inhibitors e.g. RO-5-3335, BI-201, and the like
  • protease inhibitors e.g.
  • ritonavir RTV
  • SQV saquinavir
  • ABT-378 or LPV indinavir
  • IDV amprenavir
  • VX-478 amprenavir
  • TMC126 TMC126
  • nelfinavir AG-1343
  • BMS 232,632 darunavir
  • TMC114 fosamprenavir
  • GW-640385 VX-385
  • P-1946, PL-337, PL-100, tipranavir PNU-140690
  • entry inhibitors which comprise fusion inhibitors (e.g.
  • enfuvirtide T-20
  • attachment inhibitors and co-receptor inhibitors the latter comprise the CCRS antagonists (e.g. ancriviroc, CCR5mAb004, maraviroc (UK-427,857), PRO-140, TAK-220, TAK-652, vicriviroc (SCH-D, SCH-417,690)) and CXR4 antagonists (e.g.
  • entry inhibitors are PRO-542, TNX-355, BMS-488,043, BlockAide/CRTM, FP 21399, hNM01, nonakine, VGV-1; a maturation inhibitor for example is PA-457; inhibitors of the viral integrase e.g. raltegravir (MK-0518), elvitegravir (JTK-303, GS-9137), BMS-538,158; ribozymes; immunomodulators; monoclonal antibodies; gene therapy; vaccines; siRNAs; antisense RNAs; microbicides; Zinc-finger inhibitors.
  • entry inhibitors are PRO-542, TNX-355, BMS-488,043, BlockAide/CRTM, FP 21399, hNM01, nonakine, VGV-1
  • a maturation inhibitor for example is PA-457 inhibitors of the viral integrase e.g. raltegravir (MK-0518), elvitegravir
  • the combinations may provide a synergistic effect, whereby viral infectivity and its associated symptoms may be prevented, substantially reduced, or eliminated completely.
  • the compounds of the present invention may also be administered in combination with immunomodulators (e.g., bropirimine, anti-human alpha interferon antibody, IL-2, methionine enkephalin, interferon alpha, and naltrexone) with antibiotics (e.g. pentamidine isothiorate) cytokines (e.g. Th2), modulators of cytokines, chemokines or modulators of chemokines, chemokine receptors (e.g. CCR5, CXCR4), modulators chemokine receptors, or hormones (e.g. growth hormone) to ameliorate, combat, or eliminate HIV infection and its symptoms.
  • immunomodulators e.g., bropirimine, anti-human alpha interferon antibody, IL-2, methionine enkephalin, interferon alpha, and naltrexone
  • antibiotics e.g. pentamidine isothiorate
  • cytokines e.g. Th2
  • the compounds of the present invention may also be administered in combination with modulators of the metabolization following application of the drug to an individual.
  • modulators include compounds that interfere with the metabolization at cytochromes, such as cytochrome P450. It is known that several isoenzymes exist of cytochrome P450, one of which is cytochrome P450 3A4.
  • Ritonavir is an example of a modulator of metabolization via cytochrome P450.
  • Such combination therapy in different formulations may be administered simultaneously, sequentially or independently of each other. Alternatively, such combination may be administered as a single formulation, whereby the active ingredients are released from the formulation simultaneously or separately.
  • Such modulator may be administered at the same or different ratio as the compound of the present invention.
  • the weight ratio of such modulator vis-à-vis the compound of the present invention is 1:1 or lower, more preferable the ratio is 1:3 or lower, suitably the ratio is 1:10 or lower, more suitably the ratio is 1:30 or lower.
  • the present invention focuses on the use of the present compounds for preventing or treating HIV infections, the present compounds may also be used as inhibitory agents for other viruses that depend on reverse transcriptases for multiplication.
  • the bond marked represents the bond linking the radical to the remainder of the molecule.
  • Me and Et refer to methyl and ethyl respectively.
  • n-butyllithium (1.14 ml, 3.5 eq) was added dropwise to a solution of thiazole (0.00159 mol, 3.5 eq) in 10 ml of tetrahydrofuran. This mixture was stirred one hour at ⁇ 78° C. Next, a solution of intermediate L in 5 ml tetrahydrofuran was added dropwise and the mixture was stirred for two hours at ⁇ 78° C. and then at room temperature overnight. The reaction mixture was poured into NH 4 Cl 10% and extracted with a mixture of CH 2 Cl 2 /tetrahydrofuran/methanol.
  • the human T-cell line MT4 was engineered with Green Fluorescent Protein (GFP) and a HIV-specific promoter, HIV-1 long terminal repeat (LTR).
  • GFP Green Fluorescent Protein
  • LTR-EGFP HIV-1 long terminal repeat
  • the Tat protein is produced, which upregulates the LTR promotor and eventually leads to stimulation of the GFP reporter production, allowing to measure ongoing HIV-infection fluorometrically.
  • MT4 cells were engineered with GFP and the constitutional cytomegalovirus (CMV) promotor.
  • CMV constitutional cytomegalovirus
  • This cell line was designated MT4 CMV-EGFP, and can be used for the in vitro evaluation of cytotoxicity of investigational compounds.
  • GFP levels are comparably to those of infected MT4 LTR-EGFP cells.
  • Cytotoxic investigational compounds reduce GFP levels of mock-infected MT4 CMV-EGFP cells.
  • Effective concentration values such as 50% effective concentration (EC50) can be determined and are usually expressed in ⁇ M.
  • An EC50 value is defined as the concentration of test compound that reduces the fluorescence of HIV-infected cells by 50%.
  • the 50% cytotoxic concentration (CC50 in ⁇ M) is defined as the concentration of test compound that reduces fluorescence of the mock-infected cells by 50%.
  • the ratio of CC50 to EC50 is defined as the selectivity index (SI) and is an indication of the selectivity of the anti-HIV activity of the inhibitor.
  • SI selectivity index
  • the columns IIIB, L100I, etc. in the table list the pEC 50 ( ⁇ log EC50) values against various strains IIIB, L100I, etc.; pSI lists the ⁇ log SI values.
  • Strain IIIB is wild type HIV strain.
  • MDR refers to a strain that contains mutations L100I, K103N, Y181C, E138G, V1791, L2214F, V278V/I and A327A/V in HIV reverse transcriptase.

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